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   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2006 by Magnus Lundin                                   *
   6  *   lundin@mlu.mine.nu                                                    *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #include "replacements.h"
  31
  32 #include "cortex_m3.h"
  33 #include "armv7m.h"
  34
  35 #include "register.h"
  36 #include "target.h"
  37 #include "target_request.h"
  38 #include "log.h"
  39 #include "jtag.h"
  40 #include "arm_jtag.h"
  41
  42 #include <stdlib.h>
  43 #include <string.h>
  44
  45 /* cli handling */
  46 int cortex_m3_register_commands(struct command_context_s *cmd_ctx);
  47
  48 /* forward declarations */
  49 void cortex_m3_enable_breakpoints(struct target_s *target);
  50 void cortex_m3_enable_watchpoints(struct target_s *target);
  51 int cortex_m3_target_create(struct target_s *target, Jim_Interp *interp);
  52 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  53 int cortex_m3_quit(void);
  54 int cortex_m3_load_core_reg_u32(target_t *target, enum armv7m_regtype type, u32 num, u32 *value);
  55 int cortex_m3_store_core_reg_u32(target_t *target, enum armv7m_regtype type, u32 num, u32 value);
  56 int cortex_m3_target_request_data(target_t *target, u32 size, u8 *buffer);
  57 int cortex_m3_examine(struct target_s *target);
  58
  59 #ifdef ARMV7_GDB_HACKS
  60 extern u8 armv7m_gdb_dummy_cpsr_value[];
  61 extern reg_t armv7m_gdb_dummy_cpsr_reg;
  62 #endif
  63
  64 target_type_t cortexm3_target =
  65 {
  66         .name = "cortex_m3",
  67
  68         .poll = cortex_m3_poll,
  69         .arch_state = armv7m_arch_state,
  70
  71         .target_request_data = cortex_m3_target_request_data,
  72
  73         .halt = cortex_m3_halt,
  74         .resume = cortex_m3_resume,
  75         .step = cortex_m3_step,
  76
  77         .assert_reset = cortex_m3_assert_reset,
  78         .deassert_reset = cortex_m3_deassert_reset,
  79         .soft_reset_halt = cortex_m3_soft_reset_halt,
  80
  81         .get_gdb_reg_list = armv7m_get_gdb_reg_list,
  82
  83         .read_memory = cortex_m3_read_memory,
  84         .write_memory = cortex_m3_write_memory,
  85         .bulk_write_memory = cortex_m3_bulk_write_memory,
  86         .checksum_memory = armv7m_checksum_memory,
  87         .blank_check_memory = armv7m_blank_check_memory,
  88
  89         .run_algorithm = armv7m_run_algorithm,
  90
  91         .add_breakpoint = cortex_m3_add_breakpoint,
  92         .remove_breakpoint = cortex_m3_remove_breakpoint,
  93         .add_watchpoint = cortex_m3_add_watchpoint,
  94         .remove_watchpoint = cortex_m3_remove_watchpoint,
  95
  96         .register_commands = cortex_m3_register_commands,
  97         .target_create = cortex_m3_target_create,
  98         .init_target = cortex_m3_init_target,
  99         .examine = cortex_m3_examine,
 100         .quit = cortex_m3_quit
 101 };
 102
 103 int cortex_m3_clear_halt(target_t *target)
 104 {
 105         /* get pointers to arch-specific information */
 106         armv7m_common_t *armv7m = target->arch_info;
 107         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 108         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 109
 110     /* Read Debug Fault Status Register */
 111     ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 112     /* Write Debug Fault Status Register to enable processing to resume ?? Try with and without this !! */
 113     ahbap_write_system_atomic_u32(swjdp, NVIC_DFSR, cortex_m3->nvic_dfsr);
 114     LOG_DEBUG(" NVIC_DFSR 0x%x", cortex_m3->nvic_dfsr);
 115
 116     return ERROR_OK;
 117 }
 118
 119 int cortex_m3_single_step_core(target_t *target)
 120 {
 121         /* get pointers to arch-specific information */
 122         armv7m_common_t *armv7m = target->arch_info;
 123         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 124         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 125
 126         if (!(cortex_m3->dcb_dhcsr & C_MASKINTS))
 127                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_HALT | C_DEBUGEN );
 128         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_MASKINTS | C_STEP | C_DEBUGEN );
 129         cortex_m3->dcb_dhcsr |= C_MASKINTS;
 130         LOG_DEBUG(" ");
 131         cortex_m3_clear_halt(target);
 132
 133         return ERROR_OK;
 134 }
 135
 136 int cortex_m3_exec_opcode(target_t *target,u32 opcode, int len /* MODE, r0_invalue, &r0_outvalue */ )
 137 {
 138         /* get pointers to arch-specific information */
 139         armv7m_common_t *armv7m = target->arch_info;
 140         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 141         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 142         u32 savedram;
 143         int retvalue;
 144
 145         ahbap_read_system_u32(swjdp, 0x20000000, &savedram);
 146         ahbap_write_system_u32(swjdp, 0x20000000, opcode);
 147         ahbap_write_coreregister_u32(swjdp, 0x20000000, 15);
 148         cortex_m3_single_step_core(target);
 149         armv7m->core_cache->reg_list[15].dirty = armv7m->core_cache->reg_list[15].valid;
 150         retvalue = ahbap_write_system_atomic_u32(swjdp, 0x20000000, savedram);
 151
 152         return retvalue;
 153 }
 154
 155 #if 0
 156 /* Enable interrupts */
 157 int cortex_m3_cpsie(target_t *target, u32 IF)
 158 {
 159         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSIE(IF), 2);
 160 }
 161
 162 /* Disable interrupts */
 163 int cortex_m3_cpsid(target_t *target, u32 IF)
 164 {
 165         return cortex_m3_exec_opcode(target, ARMV7M_T_CPSID(IF), 2);
 166 }
 167 #endif
 168
 169 int cortex_m3_endreset_event(target_t *target)
 170 {
 171         int i;
 172         u32 dcb_demcr;
 173
 174         /* get pointers to arch-specific information */
 175         armv7m_common_t *armv7m = target->arch_info;
 176         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 177         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 178         cortex_m3_fp_comparator_t *fp_list = cortex_m3->fp_comparator_list;
 179         cortex_m3_dwt_comparator_t *dwt_list = cortex_m3->dwt_comparator_list;
 180
 181         ahbap_read_system_atomic_u32(swjdp, DCB_DEMCR, &dcb_demcr);
 182         LOG_DEBUG("DCB_DEMCR = 0x%8.8x",dcb_demcr);
 183
 184         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 185
 186         /* Enable debug requests */
 187         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 188         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 189                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 190         /* Enable trace and dwt */
 191         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR );
 192         /* Monitor bus faults */
 193         ahbap_write_system_u32(swjdp, NVIC_SHCSR, SHCSR_BUSFAULTENA );
 194
 195         /* Enable FPB */
 196         target_write_u32(target, FP_CTRL, 3);
 197
 198         /* Restore FPB registers */
 199         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
 200         {
 201                 target_write_u32(target, fp_list[i].fpcr_address, fp_list[i].fpcr_value);
 202         }
 203
 204         /* Restore DWT registers */
 205         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
 206         {
 207                 target_write_u32(target, dwt_list[i].dwt_comparator_address, dwt_list[i].comp);
 208                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x4, dwt_list[i].mask);
 209                 target_write_u32(target, dwt_list[i].dwt_comparator_address | 0x8, dwt_list[i].function);
 210         }
 211         swjdp_transaction_endcheck(swjdp);
 212
 213         armv7m_invalidate_core_regs(target);
 214         return ERROR_OK;
 215 }
 216
 217 int cortex_m3_examine_debug_reason(target_t *target)
 218 {
 219         /* get pointers to arch-specific information */
 220         armv7m_common_t *armv7m = target->arch_info;
 221         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 222
 223         /* THIS IS NOT GOOD, TODO - better logic for detection of debug state reason */
 224         /* only check the debug reason if we don't know it already */
 225
 226         if ((target->debug_reason != DBG_REASON_DBGRQ)
 227                 && (target->debug_reason != DBG_REASON_SINGLESTEP))
 228         {
 229                 /*  INCOMPLETE */
 230
 231                 if (cortex_m3->nvic_dfsr & DFSR_BKPT)
 232                 {
 233                         target->debug_reason = DBG_REASON_BREAKPOINT;
 234                         if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 235                                 target->debug_reason = DBG_REASON_WPTANDBKPT;
 236                 }
 237                 else if (cortex_m3->nvic_dfsr & DFSR_DWTTRAP)
 238                         target->debug_reason = DBG_REASON_WATCHPOINT;
 239         }
 240
 241         return ERROR_OK;
 242 }
 243
 244 int cortex_m3_examine_exception_reason(target_t *target)
 245 {
 246         u32 shcsr, except_sr, cfsr = -1, except_ar = -1;
 247
 248         /* get pointers to arch-specific information */
 249         armv7m_common_t *armv7m = target->arch_info;
 250         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 251         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 252
 253         ahbap_read_system_u32(swjdp, NVIC_SHCSR, &shcsr);
 254         switch (armv7m->exception_number)
 255         {
 256                 case 2: /* NMI */
 257                         break;
 258                 case 3: /* Hard Fault */
 259                         ahbap_read_system_atomic_u32(swjdp, NVIC_HFSR, &except_sr);
 260                         if (except_sr & 0x40000000)
 261                         {
 262                                 ahbap_read_system_u32(swjdp, NVIC_CFSR, &cfsr);
 263                         }
 264                         break;
 265                 case 4: /* Memory Management */
 266                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 267                         ahbap_read_system_u32(swjdp, NVIC_MMFAR, &except_ar);
 268                         break;
 269                 case 5: /* Bus Fault */
 270                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 271                         ahbap_read_system_u32(swjdp, NVIC_BFAR, &except_ar);
 272                         break;
 273                 case 6: /* Usage Fault */
 274                         ahbap_read_system_u32(swjdp, NVIC_CFSR, &except_sr);
 275                         break;
 276                 case 11:        /* SVCall */
 277                         break;
 278                 case 12:        /* Debug Monitor */
 279                         ahbap_read_system_u32(swjdp, NVIC_DFSR, &except_sr);
 280                         break;
 281                 case 14:        /* PendSV */
 282                         break;
 283                 case 15:        /* SysTick */
 284                         break;
 285                 default:
 286                         except_sr = 0;
 287                         break;
 288         }
 289         swjdp_transaction_endcheck(swjdp);
 290     LOG_DEBUG("%s SHCSR 0x%x, SR 0x%x, CFSR 0x%x, AR 0x%x", armv7m_exception_string(armv7m->exception_number), \
 291         shcsr, except_sr, cfsr, except_ar);
 292         return ERROR_OK;
 293 }
 294
 295 int cortex_m3_debug_entry(target_t *target)
 296 {
 297         int i;
 298         u32 xPSR;
 299         int retval;
 300
 301         /* get pointers to arch-specific information */
 302         armv7m_common_t *armv7m = target->arch_info;
 303         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 304         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 305
 306         LOG_DEBUG(" ");
 307         if (armv7m->pre_debug_entry)
 308                 armv7m->pre_debug_entry(target);
 309
 310         cortex_m3_clear_halt(target);
 311         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 312
 313         if ((retval = armv7m->examine_debug_reason(target)) != ERROR_OK)
 314                 return retval;
 315
 316         /* Examine target state and mode */
 317         /* First load register acessible through core debug port*/
 318         for (i = 0; i < ARMV7M_PRIMASK; i++)
 319         {
 320                 if (!armv7m->core_cache->reg_list[i].valid)
 321                         armv7m->read_core_reg(target, i);
 322         }
 323
 324         xPSR = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32);
 325
 326 #ifdef ARMV7_GDB_HACKS
 327         /* copy real xpsr reg for gdb, setting thumb bit */
 328         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 0, 32, xPSR);
 329         buf_set_u32(armv7m_gdb_dummy_cpsr_value, 5, 1, 1);
 330         armv7m_gdb_dummy_cpsr_reg.valid = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 331         armv7m_gdb_dummy_cpsr_reg.dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty;
 332 #endif
 333
 334         /* For IT instructions xPSR must be reloaded on resume and clear on debug exec */
 335         if (xPSR & 0xf00)
 336         {
 337                 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = armv7m->core_cache->reg_list[ARMV7M_xPSR].valid;
 338                 cortex_m3_store_core_reg_u32(target, ARMV7M_REGISTER_CORE_GP, 16, xPSR &~ 0xff);
 339         }
 340
 341         /* Now we can load SP core registers */
 342         for (i = ARMV7M_PRIMASK; i < ARMV7NUMCOREREGS; i++)
 343         {
 344                 if (!armv7m->core_cache->reg_list[i].valid)
 345                         armv7m->read_core_reg(target, i);
 346         }
 347
 348         /* Are we in an exception handler */
 349         if (xPSR & 0x1FF)
 350         {
 351                 armv7m->core_mode = ARMV7M_MODE_HANDLER;
 352                 armv7m->exception_number = (xPSR & 0x1FF);
 353         }
 354         else
 355         {
 356                 armv7m->core_mode = buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_CONTROL].value, 0, 1);
 357                 armv7m->exception_number = 0;
 358         }
 359
 360         if (armv7m->exception_number)
 361         {
 362                 cortex_m3_examine_exception_reason(target);
 363         }
 364
 365         LOG_DEBUG("entered debug state in core mode: %s at PC 0x%x, target->state: %s",
 366                   armv7m_mode_strings[armv7m->core_mode],
 367                   *(u32*)(armv7m->core_cache->reg_list[15].value),
 368                   Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
 369
 370         if (armv7m->post_debug_entry)
 371                 armv7m->post_debug_entry(target);
 372
 373         return ERROR_OK;
 374 }
 375
 376 int cortex_m3_poll(target_t *target)
 377 {
 378         int retval;
 379         u32 prev_target_state = target->state;
 380
 381         /* get pointers to arch-specific information */
 382         armv7m_common_t *armv7m = target->arch_info;
 383         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 384         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 385
 386         /* Read from Debug Halting Control and Status Register */
 387         retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 388         if (retval != ERROR_OK)
 389         {
 390                 target->state = TARGET_UNKNOWN;
 391                 return retval;
 392         }
 393
 394         if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 395         {
 396                 /* check if still in reset */
 397                 ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 398
 399                 if (cortex_m3->dcb_dhcsr & S_RESET_ST)
 400                 {
 401                         target->state = TARGET_RESET;
 402                         return ERROR_OK;
 403                 }
 404         }
 405
 406         if (target->state == TARGET_RESET)
 407         {
 408                 /* Cannot switch context while running so endreset is called with target->state == TARGET_RESET */
 409                 LOG_DEBUG("Exit from reset with dcb_dhcsr 0x%x", cortex_m3->dcb_dhcsr);
 410                 cortex_m3_endreset_event(target);
 411                 target->state = TARGET_RUNNING;
 412                 prev_target_state = TARGET_RUNNING;
 413         }
 414
 415         if (cortex_m3->dcb_dhcsr & S_HALT)
 416         {
 417                 target->state = TARGET_HALTED;
 418
 419                 if ((prev_target_state == TARGET_RUNNING) || (prev_target_state == TARGET_RESET))
 420                 {
 421                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 422                                 return retval;
 423
 424                         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 425                 }
 426                 if (prev_target_state == TARGET_DEBUG_RUNNING)
 427                 {
 428                         LOG_DEBUG(" ");
 429                         if ((retval = cortex_m3_debug_entry(target)) != ERROR_OK)
 430                                 return retval;
 431
 432                         target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
 433                 }
 434         }
 435
 436         /*
 437         if (cortex_m3->dcb_dhcsr & S_SLEEP)
 438                 target->state = TARGET_SLEEP;
 439         */
 440
 441 #if 0
 442     /* Read Debug Fault Status Register, added to figure out the lockup when running flashtest.script  */
 443         ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 444         LOG_DEBUG("dcb_dhcsr 0x%x, nvic_dfsr 0x%x, target->state: %s", cortex_m3->dcb_dhcsr, cortex_m3->nvic_dfsr, Jim_Nvp_value2name( nvp_target_state, target->state )->name );
 445 #endif
 446
 447         return ERROR_OK;
 448 }
 449
 450 int cortex_m3_halt(target_t *target)
 451 {
 452         /* get pointers to arch-specific information */
 453         armv7m_common_t *armv7m = target->arch_info;
 454         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 455         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 456
 457         LOG_DEBUG("target->state: %s",
 458                   Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name );
 459
 460         if (target->state == TARGET_HALTED)
 461         {
 462                 LOG_DEBUG("target was already halted");
 463                 return ERROR_OK;
 464         }
 465
 466         if (target->state == TARGET_UNKNOWN)
 467         {
 468                 LOG_WARNING("target was in unknown state when halt was requested");
 469         }
 470
 471         if (target->state == TARGET_RESET)
 472         {
 473                 if ((jtag_reset_config & RESET_SRST_PULLS_TRST) && jtag_srst)
 474                 {
 475                         LOG_ERROR("can't request a halt while in reset if nSRST pulls nTRST");
 476                         return ERROR_TARGET_FAILURE;
 477                 }
 478                 else
 479                 {
 480                         /* we came here in a reset_halt or reset_init sequence
 481                          * debug entry was already prepared in cortex_m3_prepare_reset_halt()
 482                          */
 483                         target->debug_reason = DBG_REASON_DBGRQ;
 484
 485                         return ERROR_OK;
 486                 }
 487         }
 488
 489         /* Write to Debug Halting Control and Status Register */
 490         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 491
 492         target->debug_reason = DBG_REASON_DBGRQ;
 493
 494         return ERROR_OK;
 495 }
 496
 497 int cortex_m3_soft_reset_halt(struct target_s *target)
 498 {
 499         /* get pointers to arch-specific information */
 500         armv7m_common_t *armv7m = target->arch_info;
 501         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 502         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 503         u32 dcb_dhcsr = 0;
 504         int retval, timeout = 0;
 505
 506         /* Enter debug state on reset, cf. end_reset_event() */
 507         ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 508
 509         /* Request a reset */
 510         ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_VECTRESET );
 511         target->state = TARGET_RESET;
 512
 513         /* registers are now invalid */
 514         armv7m_invalidate_core_regs(target);
 515
 516         while (timeout < 100)
 517         {
 518                 retval = ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &dcb_dhcsr);
 519                 if (retval == ERROR_OK)
 520                 {
 521                     ahbap_read_system_atomic_u32(swjdp, NVIC_DFSR, &cortex_m3->nvic_dfsr);
 522                         if ((dcb_dhcsr & S_HALT) && (cortex_m3->nvic_dfsr & DFSR_VCATCH))
 523                         {
 524                                 LOG_DEBUG("system reset-halted, dcb_dhcsr 0x%x, nvic_dfsr 0x%x", dcb_dhcsr, cortex_m3->nvic_dfsr);
 525                                 cortex_m3_poll(target);
 526                                 return ERROR_OK;
 527                         }
 528                         else
 529                                 LOG_DEBUG("waiting for system reset-halt, dcb_dhcsr 0x%x, %i ms", dcb_dhcsr, timeout);
 530                 }
 531                 timeout++;
 532                 alive_sleep(1);
 533         }
 534
 535         return ERROR_OK;
 536 }
 537
 538 int cortex_m3_resume(struct target_s *target, int current, u32 address, int handle_breakpoints, int debug_execution)
 539 {
 540         /* get pointers to arch-specific information */
 541         armv7m_common_t *armv7m = target->arch_info;
 542         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 543         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 544         breakpoint_t *breakpoint = NULL;
 545         u32 dcb_dhcsr, resume_pc;
 546
 547         if (target->state != TARGET_HALTED)
 548         {
 549                 LOG_WARNING("target not halted");
 550                 return ERROR_TARGET_NOT_HALTED;
 551         }
 552
 553         if (!debug_execution)
 554         {
 555                 target_free_all_working_areas(target);
 556                 cortex_m3_enable_breakpoints(target);
 557                 cortex_m3_enable_watchpoints(target);
 558
 559                 /* TODOLATER Interrupt handling/disable for debug execution, cache ... ... */
 560         }
 561
 562         dcb_dhcsr = DBGKEY | C_DEBUGEN;
 563         if (debug_execution)
 564         {
 565                 /* Disable interrupts */
 566                 /*
 567                    We disable interrupts in the PRIMASK register instead of masking with C_MASKINTS,
 568                    This is probably the same inssue as Cortex-M3 Errata 377493:
 569                    C_MASKINTS in parallel with disabled interrupts can cause local faults to not be taken.
 570                 */
 571                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
 572                 /* Make sure we are in Thumb mode */
 573                 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
 574                         buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1<<24));
 575         }
 576
 577         /* current = 1: continue on current pc, otherwise continue at <address> */
 578         if (!current)
 579         {
 580                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 581                 armv7m->core_cache->reg_list[15].dirty = 1;
 582                 armv7m->core_cache->reg_list[15].valid = 1;
 583         }
 584
 585         resume_pc = buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32);
 586
 587         armv7m_restore_context(target);
 588
 589         /* the front-end may request us not to handle breakpoints */
 590         if (handle_breakpoints)
 591         {
 592                 /* Single step past breakpoint at current address */
 593                 if ((breakpoint = breakpoint_find(target, resume_pc)))
 594                 {
 595                         LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
 596                         cortex_m3_unset_breakpoint(target, breakpoint);
 597                         cortex_m3_single_step_core(target);
 598                         cortex_m3_set_breakpoint(target, breakpoint);
 599                 }
 600         }
 601
 602         /* Set/Clear C_MASKINTS in a separate operation */
 603         if ((cortex_m3->dcb_dhcsr & C_MASKINTS) != (dcb_dhcsr & C_MASKINTS))
 604                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr | C_HALT );
 605
 606         /* Restart core */
 607         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, dcb_dhcsr );
 608         target->debug_reason = DBG_REASON_NOTHALTED;
 609
 610         /* registers are now invalid */
 611         armv7m_invalidate_core_regs(target);
 612         if (!debug_execution)
 613         {
 614                 target->state = TARGET_RUNNING;
 615                 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 616                 LOG_DEBUG("target resumed at 0x%x",resume_pc);
 617         }
 618         else
 619         {
 620                 target->state = TARGET_DEBUG_RUNNING;
 621                 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
 622                 LOG_DEBUG("target debug resumed at 0x%x",resume_pc);
 623         }
 624
 625         return ERROR_OK;
 626 }
 627
 628 /* int irqstepcount=0; */
 629 int cortex_m3_step(struct target_s *target, int current, u32 address, int handle_breakpoints)
 630 {
 631         /* get pointers to arch-specific information */
 632         armv7m_common_t *armv7m = target->arch_info;
 633         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 634         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 635         breakpoint_t *breakpoint = NULL;
 636
 637         if (target->state != TARGET_HALTED)
 638         {
 639                 LOG_WARNING("target not halted");
 640                 return ERROR_TARGET_NOT_HALTED;
 641         }
 642
 643         /* current = 1: continue on current pc, otherwise continue at <address> */
 644         if (!current)
 645                 buf_set_u32(armv7m->core_cache->reg_list[15].value, 0, 32, address);
 646
 647         /* the front-end may request us not to handle breakpoints */
 648         if (handle_breakpoints)
 649                 if ((breakpoint = breakpoint_find(target, buf_get_u32(armv7m->core_cache->reg_list[15].value, 0, 32))))
 650                         cortex_m3_unset_breakpoint(target, breakpoint);
 651
 652         target->debug_reason = DBG_REASON_SINGLESTEP;
 653
 654         armv7m_restore_context(target);
 655
 656         target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
 657
 658         if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 659                 ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN );
 660         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY| C_STEP | C_DEBUGEN);
 661         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 662
 663         /* registers are now invalid */
 664         armv7m_invalidate_core_regs(target);
 665
 666         if (breakpoint)
 667                 cortex_m3_set_breakpoint(target, breakpoint);
 668
 669         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 670
 671         cortex_m3_debug_entry(target);
 672         target_call_event_callbacks(target, TARGET_EVENT_HALTED);
 673
 674         LOG_DEBUG("target stepped dcb_dhcsr = 0x%x nvic_icsr = 0x%x", cortex_m3->dcb_dhcsr, cortex_m3->nvic_icsr);
 675         return ERROR_OK;
 676 }
 677
 678 int cortex_m3_assert_reset(target_t *target)
 679 {
 680         armv7m_common_t *armv7m = target->arch_info;
 681         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 682         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
 683         int assert_srst = 1;
 684
 685         LOG_DEBUG("target->state: %s",
 686                   Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name );
 687
 688         if (!(jtag_reset_config & RESET_HAS_SRST))
 689         {
 690                 LOG_ERROR("Can't assert SRST");
 691                 return ERROR_FAIL;
 692         }
 693
 694         /* Enable debug requests */
 695         ahbap_read_system_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
 696         if (!(cortex_m3->dcb_dhcsr & C_DEBUGEN))
 697                 ahbap_write_system_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN );
 698
 699         ahbap_write_system_u32(swjdp, DCB_DCRDR, 0 );
 700
 701         if (!target->reset_halt)
 702         {
 703                 /* Set/Clear C_MASKINTS in a separate operation */
 704                 if (cortex_m3->dcb_dhcsr & C_MASKINTS)
 705                         ahbap_write_system_atomic_u32(swjdp, DCB_DHCSR, DBGKEY | C_DEBUGEN | C_HALT );
 706
 707                 cortex_m3_clear_halt(target);
 708
 709                 /* Enter debug state on reset, cf. end_reset_event() */
 710                 ahbap_write_system_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR);
 711         }
 712         else
 713         {
 714                 /* Enter debug state on reset, cf. end_reset_event() */
 715                 ahbap_write_system_atomic_u32(swjdp, DCB_DEMCR, TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET );
 716         }
 717
 718         /* following hack is to handle luminary reset
 719          * when srst is asserted the luminary device seesm to also clear the debug registers
 720          * which does not match the armv7 debug TRM */
 721
 722         if (strcmp(cortex_m3->variant, "lm3s") == 0)
 723         {
 724                 /* get revision of lm3s target, only early silicon has this issue
 725                  * Fury Rev B, DustDevil Rev B, Tempest all ok */
 726
 727                 u32 did0;
 728
 729                 if (target_read_u32(target, 0x400fe000, &did0) == ERROR_OK)
 730                 {
 731                         switch ((did0 >> 16) & 0xff)
 732                         {
 733                                 case 0:
 734                                         /* all Sandstorm suffer issue */
 735                                         assert_srst = 0;
 736                                         break;
 737
 738                                 case 1:
 739                                 case 3:
 740                                         /* only Fury/DustDevil rev A suffer reset problems */
 741                                         if (((did0 >> 8) & 0xff) == 0)
 742                                                 assert_srst = 0;
 743                                         break;
 744                         }
 745                 }
 746         }
 747
 748         if (assert_srst)
 749         {
 750                 /* default to asserting srst */
 751                 if (jtag_reset_config & RESET_SRST_PULLS_TRST)
 752                 {
 753                         jtag_add_reset(1, 1);
 754                 }
 755                 else
 756                 {
 757                         jtag_add_reset(0, 1);
 758                 }
 759         }
 760         else
 761         {
 762                 /* this causes the luminary device to reset using the watchdog */
 763                 ahbap_write_system_atomic_u32(swjdp, NVIC_AIRCR, AIRCR_VECTKEY | AIRCR_SYSRESETREQ );
 764                 LOG_DEBUG("Using Luminary Reset: SYSRESETREQ");
 765         }
 766
 767         target->state = TARGET_RESET;
 768         jtag_add_sleep(50000);
 769
 770         armv7m_invalidate_core_regs(target);
 771
 772     if (target->reset_halt)
 773     {
 774         int retval;
 775                 if ((retval = target_halt(target))!=ERROR_OK)
 776                         return retval;
 777     }
 778
 779         return ERROR_OK;
 780 }
 781
 782 int cortex_m3_deassert_reset(target_t *target)
 783 {
 784         LOG_DEBUG("target->state: %s",
 785                   Jim_Nvp_value2name_simple( nvp_target_state, target->state )->name);
 786
 787         /* deassert reset lines */
 788         jtag_add_reset(0, 0);
 789
 790         return ERROR_OK;
 791 }
 792
 793 void cortex_m3_enable_breakpoints(struct target_s *target)
 794 {
 795         breakpoint_t *breakpoint = target->breakpoints;
 796
 797         /* set any pending breakpoints */
 798         while (breakpoint)
 799         {
 800                 if (breakpoint->set == 0)
 801                         cortex_m3_set_breakpoint(target, breakpoint);
 802                 breakpoint = breakpoint->next;
 803         }
 804 }
 805
 806 int cortex_m3_set_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 807 {
 808         int fp_num=0;
 809         u32 hilo;
 810
 811         /* get pointers to arch-specific information */
 812         armv7m_common_t *armv7m = target->arch_info;
 813         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 814
 815         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 816
 817         if (breakpoint->set)
 818         {
 819                 LOG_WARNING("breakpoint already set");
 820                 return ERROR_OK;
 821         }
 822
 823         if (cortex_m3->auto_bp_type)
 824         {
 825                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 826         }
 827
 828         if (breakpoint->type == BKPT_HARD)
 829         {
 830                 while(comparator_list[fp_num].used && (fp_num < cortex_m3->fp_num_code))
 831                         fp_num++;
 832                 if (fp_num >= cortex_m3->fp_num_code)
 833                 {
 834                         LOG_DEBUG("ERROR Can not find free FP Comparator");
 835                         LOG_WARNING("ERROR Can not find free FP Comparator");
 836                         exit(-1);
 837                 }
 838                 breakpoint->set = fp_num + 1;
 839                 hilo = (breakpoint->address & 0x2) ? FPCR_REPLACE_BKPT_HIGH : FPCR_REPLACE_BKPT_LOW;
 840                 comparator_list[fp_num].used = 1;
 841                 comparator_list[fp_num].fpcr_value = (breakpoint->address & 0x1FFFFFFC) | hilo | 1;
 842                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 843                 LOG_DEBUG("fpc_num %i fpcr_value 0x%x", fp_num, comparator_list[fp_num].fpcr_value);
 844         }
 845         else if (breakpoint->type == BKPT_SOFT)
 846         {
 847                 u8 code[4];
 848                 buf_set_u32(code, 0, 32, ARMV7M_T_BKPT(0x11));
 849                 target->type->read_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, breakpoint->orig_instr);
 850                 target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, breakpoint->length, 1, code);
 851                 breakpoint->set = 0x11; /* Any nice value but 0 */
 852         }
 853
 854         return ERROR_OK;
 855 }
 856
 857 int cortex_m3_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 858 {
 859         /* get pointers to arch-specific information */
 860         armv7m_common_t *armv7m = target->arch_info;
 861         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 862         cortex_m3_fp_comparator_t * comparator_list = cortex_m3->fp_comparator_list;
 863
 864         if (!breakpoint->set)
 865         {
 866                 LOG_WARNING("breakpoint not set");
 867                 return ERROR_OK;
 868         }
 869
 870         if (breakpoint->type == BKPT_HARD)
 871         {
 872                 int fp_num = breakpoint->set - 1;
 873                 if ((fp_num < 0) || (fp_num >= cortex_m3->fp_num_code))
 874                 {
 875                         LOG_DEBUG("Invalid FP Comparator number in breakpoint");
 876                         return ERROR_OK;
 877                 }
 878                 comparator_list[fp_num].used = 0;
 879                 comparator_list[fp_num].fpcr_value = 0;
 880                 target_write_u32(target, comparator_list[fp_num].fpcr_address, comparator_list[fp_num].fpcr_value);
 881         }
 882         else
 883         {
 884                 /* restore original instruction (kept in target endianness) */
 885                 if (breakpoint->length == 4)
 886                 {
 887                         target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 4, 1, breakpoint->orig_instr);
 888                 }
 889                 else
 890                 {
 891                         target->type->write_memory(target, breakpoint->address & 0xFFFFFFFE, 2, 1, breakpoint->orig_instr);
 892                 }
 893         }
 894         breakpoint->set = 0;
 895
 896         return ERROR_OK;
 897 }
 898
 899 int cortex_m3_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 900 {
 901         /* get pointers to arch-specific information */
 902         armv7m_common_t *armv7m = target->arch_info;
 903         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 904
 905         if (cortex_m3->auto_bp_type)
 906         {
 907                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 908 #ifdef ARMV7_GDB_HACKS
 909                 if (breakpoint->length != 2) {
 910                         /* XXX Hack: Replace all breakpoints with length != 2 with
 911                          * a hardware breakpoint. */
 912                         breakpoint->type = BKPT_HARD;
 913                         breakpoint->length = 2;
 914                 }
 915 #endif
 916         }
 917
 918         if ((breakpoint->type == BKPT_HARD) && (breakpoint->address >= 0x20000000))
 919         {
 920                 LOG_INFO("flash patch comparator requested outside code memory region");
 921                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 922         }
 923
 924         if ((breakpoint->type == BKPT_SOFT) && (breakpoint->address < 0x20000000))
 925         {
 926                 LOG_INFO("soft breakpoint requested in code (flash) memory region");
 927                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 928         }
 929
 930         if ((breakpoint->type == BKPT_HARD) && (cortex_m3->fp_code_available < 1))
 931         {
 932                 LOG_INFO("no flash patch comparator unit available for hardware breakpoint");
 933                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 934         }
 935
 936         if ((breakpoint->length != 2))
 937         {
 938                 LOG_INFO("only breakpoints of two bytes length supported");
 939                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 940         }
 941
 942         if (breakpoint->type == BKPT_HARD)
 943                 cortex_m3->fp_code_available--;
 944         cortex_m3_set_breakpoint(target, breakpoint);
 945
 946         return ERROR_OK;
 947 }
 948
 949 int cortex_m3_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 950 {
 951         /* get pointers to arch-specific information */
 952         armv7m_common_t *armv7m = target->arch_info;
 953         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 954
 955         if (target->state != TARGET_HALTED)
 956         {
 957                 LOG_WARNING("target not halted");
 958                 return ERROR_TARGET_NOT_HALTED;
 959         }
 960
 961         if (cortex_m3->auto_bp_type)
 962         {
 963                 breakpoint->type = (breakpoint->address < 0x20000000) ? BKPT_HARD : BKPT_SOFT;
 964         }
 965
 966         if (breakpoint->set)
 967         {
 968                 cortex_m3_unset_breakpoint(target, breakpoint);
 969         }
 970
 971         if (breakpoint->type == BKPT_HARD)
 972                 cortex_m3->fp_code_available++;
 973
 974         return ERROR_OK;
 975 }
 976
 977 int cortex_m3_set_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
 978 {
 979         int dwt_num=0;
 980         u32 mask, temp;
 981
 982         /* get pointers to arch-specific information */
 983         armv7m_common_t *armv7m = target->arch_info;
 984         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
 985         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
 986
 987         if (watchpoint->set)
 988         {
 989                 LOG_WARNING("watchpoint already set");
 990                 return ERROR_OK;
 991         }
 992
 993         if (watchpoint->mask == 0xffffffffu)
 994         {
 995                 while(comparator_list[dwt_num].used && (dwt_num < cortex_m3->dwt_num_comp))
 996                         dwt_num++;
 997                 if (dwt_num >= cortex_m3->dwt_num_comp)
 998                 {
 999                         LOG_DEBUG("ERROR Can not find free DWT Comparator");
1000                         LOG_WARNING("ERROR Can not find free DWT Comparator");
1001                         return -1;
1002                 }
1003                 watchpoint->set = dwt_num + 1;
1004                 mask = 0;
1005                 temp = watchpoint->length;
1006                 while (temp > 1)
1007                 {
1008                         temp = temp / 2;
1009                         mask++;
1010                 }
1011                 comparator_list[dwt_num].used = 1;
1012                 comparator_list[dwt_num].comp = watchpoint->address;
1013                 comparator_list[dwt_num].mask = mask;
1014                 comparator_list[dwt_num].function = watchpoint->rw + 5;
1015                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address, comparator_list[dwt_num].comp);
1016                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x4, comparator_list[dwt_num].mask);
1017                 target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1018                 LOG_DEBUG("dwt_num %i 0x%x 0x%x 0x%x", dwt_num, comparator_list[dwt_num].comp, comparator_list[dwt_num].mask, comparator_list[dwt_num].function);
1019         }
1020         else
1021         {
1022                 LOG_WARNING("Cannot watch data values");  /* Move this test to add_watchpoint */
1023                 return ERROR_OK;
1024         }
1025
1026         return ERROR_OK;
1027
1028 }
1029
1030 int cortex_m3_unset_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1031 {
1032         /* get pointers to arch-specific information */
1033         armv7m_common_t *armv7m = target->arch_info;
1034         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1035         cortex_m3_dwt_comparator_t * comparator_list = cortex_m3->dwt_comparator_list;
1036         int dwt_num;
1037
1038         if (!watchpoint->set)
1039         {
1040                 LOG_WARNING("watchpoint not set");
1041                 return ERROR_OK;
1042         }
1043
1044         dwt_num = watchpoint->set - 1;
1045
1046         if ((dwt_num < 0) || (dwt_num >= cortex_m3->dwt_num_comp))
1047         {
1048                 LOG_DEBUG("Invalid DWT Comparator number in watchpoint");
1049                 return ERROR_OK;
1050         }
1051         comparator_list[dwt_num].used = 0;
1052         comparator_list[dwt_num].function = 0;
1053         target_write_u32(target, comparator_list[dwt_num].dwt_comparator_address|0x8, comparator_list[dwt_num].function);
1054
1055         watchpoint->set = 0;
1056
1057         return ERROR_OK;
1058 }
1059
1060 int cortex_m3_add_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1061 {
1062         /* get pointers to arch-specific information */
1063         armv7m_common_t *armv7m = target->arch_info;
1064         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1065
1066         if (target->state != TARGET_HALTED)
1067         {
1068                 LOG_WARNING("target not halted");
1069                 return ERROR_TARGET_NOT_HALTED;
1070         }
1071
1072         if (cortex_m3->dwt_comp_available < 1)
1073         {
1074                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1075         }
1076
1077         if ((watchpoint->length != 1) && (watchpoint->length != 2) && (watchpoint->length != 4))
1078         {
1079                 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1080         }
1081
1082         cortex_m3->dwt_comp_available--;
1083
1084         return ERROR_OK;
1085 }
1086
1087 int cortex_m3_remove_watchpoint(struct target_s *target, watchpoint_t *watchpoint)
1088 {
1089         /* get pointers to arch-specific information */
1090         armv7m_common_t *armv7m = target->arch_info;
1091         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1092
1093         if (target->state != TARGET_HALTED)
1094         {
1095                 LOG_WARNING("target not halted");
1096                 return ERROR_TARGET_NOT_HALTED;
1097         }
1098
1099         if (watchpoint->set)
1100         {
1101                 cortex_m3_unset_watchpoint(target, watchpoint);
1102         }
1103
1104         cortex_m3->dwt_comp_available++;
1105
1106         return ERROR_OK;
1107 }
1108
1109 void cortex_m3_enable_watchpoints(struct target_s *target)
1110 {
1111         watchpoint_t *watchpoint = target->watchpoints;
1112
1113         /* set any pending watchpoints */
1114         while (watchpoint)
1115         {
1116                 if (watchpoint->set == 0)
1117                         cortex_m3_set_watchpoint(target, watchpoint);
1118                 watchpoint = watchpoint->next;
1119         }
1120 }
1121
1122 int cortex_m3_load_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 * value)
1123 {
1124         int retval;
1125         /* get pointers to arch-specific information */
1126         armv7m_common_t *armv7m = target->arch_info;
1127         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1128         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1129
1130         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1131         {
1132                 /* read a normal core register */
1133                 retval = ahbap_read_coreregister_u32(swjdp, value, num);
1134
1135                 if (retval != ERROR_OK)
1136                 {
1137                         LOG_ERROR("JTAG failure %i",retval);
1138                         return ERROR_JTAG_DEVICE_ERROR;
1139                 }
1140                 LOG_DEBUG("load from core reg %i  value 0x%x",num,*value);
1141         }
1142         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1143         {
1144                 /* read other registers */
1145                 ahbap_read_coreregister_u32(swjdp, value, 20);
1146
1147                 switch (num)
1148                 {
1149                         case 19:
1150                                 *value = buf_get_u32((u8*)value, 0, 8);
1151                                 break;
1152
1153                         case 20:
1154                                 *value = buf_get_u32((u8*)value, 8, 8);
1155                                 break;
1156
1157                         case 21:
1158                                 *value = buf_get_u32((u8*)value, 16, 8);
1159                                 break;
1160
1161                         case 22:
1162                                 *value = buf_get_u32((u8*)value, 24, 8);
1163                                 break;
1164                 }
1165
1166                 LOG_DEBUG("load from special reg %i value 0x%x", num, *value);
1167         }
1168         else
1169         {
1170                 return ERROR_INVALID_ARGUMENTS;
1171         }
1172
1173         return ERROR_OK;
1174 }
1175
1176 int cortex_m3_store_core_reg_u32(struct target_s *target, enum armv7m_regtype type, u32 num, u32 value)
1177 {
1178         int retval;
1179         u32 reg;
1180
1181         /* get pointers to arch-specific information */
1182         armv7m_common_t *armv7m = target->arch_info;
1183         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1184         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1185
1186 #ifdef ARMV7_GDB_HACKS
1187         /* If the LR register is being modified, make sure it will put us
1188          * in "thumb" mode, or an INVSTATE exception will occur. This is a
1189          * hack to deal with the fact that gdb will sometimes "forge"
1190          * return addresses, and doesn't set the LSB correctly (i.e., when
1191          * printing expressions containing function calls, it sets LR=0.) */
1192
1193         if (num == 14)
1194                 value |= 0x01;
1195 #endif
1196
1197         if ((type == ARMV7M_REGISTER_CORE_GP) && (num <= ARMV7M_PSP))
1198         {
1199                 retval = ahbap_write_coreregister_u32(swjdp, value, num);
1200                 if (retval != ERROR_OK)
1201                 {
1202                         LOG_ERROR("JTAG failure %i", retval);
1203                         armv7m->core_cache->reg_list[num].dirty = armv7m->core_cache->reg_list[num].valid;
1204                         return ERROR_JTAG_DEVICE_ERROR;
1205                 }
1206                 LOG_DEBUG("write core reg %i value 0x%x", num, value);
1207         }
1208         else if (type == ARMV7M_REGISTER_CORE_SP) /* Special purpose core register */
1209         {
1210                 /* write other registers */
1211
1212                 ahbap_read_coreregister_u32(swjdp, &reg, 20);
1213
1214                 switch (num)
1215                 {
1216                         case 19:
1217                                 buf_set_u32((u8*)&reg, 0, 8, value);
1218                                 break;
1219
1220                         case 20:
1221                                 buf_set_u32((u8*)&reg, 8, 8, value);
1222                                 break;
1223
1224                         case 21:
1225                                 buf_set_u32((u8*)&reg, 16, 8, value);
1226                                 break;
1227
1228                         case 22:
1229                                 buf_set_u32((u8*)&reg, 24, 8, value);
1230                                 break;
1231                 }
1232
1233                 ahbap_write_coreregister_u32(swjdp, reg, 20);
1234
1235                 LOG_DEBUG("write special reg %i value 0x%x ", num, value);
1236         }
1237         else
1238         {
1239                 return ERROR_INVALID_ARGUMENTS;
1240         }
1241
1242         return ERROR_OK;
1243 }
1244
1245 int cortex_m3_read_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1246 {
1247         /* get pointers to arch-specific information */
1248         armv7m_common_t *armv7m = target->arch_info;
1249         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1250         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1251         int retval;
1252
1253         /* sanitize arguments */
1254         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1255                 return ERROR_INVALID_ARGUMENTS;
1256
1257         /* cortex_m3 handles unaligned memory access */
1258
1259         switch (size)
1260         {
1261                 case 4:
1262                         retval = ahbap_read_buf_u32(swjdp, buffer, 4 * count, address);
1263                         break;
1264                 case 2:
1265                         retval = ahbap_read_buf_u16(swjdp, buffer, 2 * count, address);
1266                         break;
1267                 case 1:
1268                         retval = ahbap_read_buf_u8(swjdp, buffer, count, address);
1269                         break;
1270                 default:
1271                         LOG_ERROR("BUG: we shouldn't get here");
1272                         exit(-1);
1273         }
1274
1275         return retval;
1276 }
1277
1278 int cortex_m3_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer)
1279 {
1280         /* get pointers to arch-specific information */
1281         armv7m_common_t *armv7m = target->arch_info;
1282         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1283         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1284         int retval;
1285
1286         /* sanitize arguments */
1287         if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1288                 return ERROR_INVALID_ARGUMENTS;
1289
1290         switch (size)
1291         {
1292                 case 4:
1293                         retval = ahbap_write_buf_u32(swjdp, buffer, 4 * count, address);
1294                         break;
1295                 case 2:
1296                         retval = ahbap_write_buf_u16(swjdp, buffer, 2 * count, address);
1297                         break;
1298                 case 1:
1299                         retval = ahbap_write_buf_u8(swjdp, buffer, count, address);
1300                         break;
1301                 default:
1302                         LOG_ERROR("BUG: we shouldn't get here");
1303                         exit(-1);
1304         }
1305
1306         return retval;
1307 }
1308
1309 int cortex_m3_bulk_write_memory(target_t *target, u32 address, u32 count, u8 *buffer)
1310 {
1311         return cortex_m3_write_memory(target, address, 4, count, buffer);
1312 }
1313
1314 void cortex_m3_build_reg_cache(target_t *target)
1315 {
1316         armv7m_build_reg_cache(target);
1317 }
1318
1319 int cortex_m3_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
1320 {
1321         cortex_m3_build_reg_cache(target);
1322         return ERROR_OK;
1323 }
1324
1325 int cortex_m3_examine(struct target_s *target)
1326 {
1327         int retval;
1328         u32 cpuid, fpcr, dwtcr, ictr;
1329         int i;
1330
1331         /* get pointers to arch-specific information */
1332         armv7m_common_t *armv7m = target->arch_info;
1333         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1334         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1335
1336         target->type->examined = 1;
1337
1338         if ((retval=ahbap_debugport_init(swjdp))!=ERROR_OK)
1339                 return retval;
1340
1341         /* Read from Device Identification Registers */
1342         if ((retval=target_read_u32(target, CPUID, &cpuid))!=ERROR_OK)
1343                 return retval;
1344
1345         if (((cpuid >> 4) & 0xc3f) == 0xc23)
1346                 LOG_DEBUG("CORTEX-M3 processor detected");
1347         LOG_DEBUG("cpuid: 0x%8.8x", cpuid);
1348
1349         target_read_u32(target, NVIC_ICTR, &ictr);
1350         cortex_m3->intlinesnum = (ictr & 0x1F) + 1;
1351         cortex_m3->intsetenable = calloc(cortex_m3->intlinesnum, 4);
1352         for (i = 0; i < cortex_m3->intlinesnum; i++)
1353         {
1354                 target_read_u32(target, NVIC_ISE0 + 4 * i, cortex_m3->intsetenable + i);
1355                 LOG_DEBUG("interrupt enable[%i] = 0x%8.8x", i, cortex_m3->intsetenable[i]);
1356         }
1357
1358         /* Setup FPB */
1359         target_read_u32(target, FP_CTRL, &fpcr);
1360         cortex_m3->auto_bp_type = 1;
1361         cortex_m3->fp_num_code = (fpcr >> 4) & 0xF;
1362         cortex_m3->fp_num_lit = (fpcr >> 8) & 0xF;
1363         cortex_m3->fp_code_available = cortex_m3->fp_num_code;
1364         cortex_m3->fp_comparator_list = calloc(cortex_m3->fp_num_code + cortex_m3->fp_num_lit, sizeof(cortex_m3_fp_comparator_t));
1365         for (i = 0; i < cortex_m3->fp_num_code + cortex_m3->fp_num_lit; i++)
1366         {
1367                 cortex_m3->fp_comparator_list[i].type = (i < cortex_m3->fp_num_code) ? FPCR_CODE : FPCR_LITERAL;
1368                 cortex_m3->fp_comparator_list[i].fpcr_address = FP_COMP0 + 4 * i;
1369         }
1370         LOG_DEBUG("FPB fpcr 0x%x, numcode %i, numlit %i", fpcr, cortex_m3->fp_num_code, cortex_m3->fp_num_lit);
1371
1372         /* Setup DWT */
1373         target_read_u32(target, DWT_CTRL, &dwtcr);
1374         cortex_m3->dwt_num_comp = (dwtcr >> 28) & 0xF;
1375         cortex_m3->dwt_comp_available = cortex_m3->dwt_num_comp;
1376         cortex_m3->dwt_comparator_list=calloc(cortex_m3->dwt_num_comp, sizeof(cortex_m3_dwt_comparator_t));
1377         for (i = 0; i < cortex_m3->dwt_num_comp; i++)
1378         {
1379                 cortex_m3->dwt_comparator_list[i].dwt_comparator_address = DWT_COMP0 + 0x10 * i;
1380         }
1381
1382         return ERROR_OK;
1383 }
1384
1385 int cortex_m3_quit(void)
1386 {
1387
1388         return ERROR_OK;
1389 }
1390
1391 int cortex_m3_dcc_read(swjdp_common_t *swjdp, u8 *value, u8 *ctrl)
1392 {
1393         u16 dcrdr;
1394
1395         ahbap_read_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
1396         *ctrl = (u8)dcrdr;
1397         *value = (u8)(dcrdr >> 8);
1398
1399         LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1400
1401         /* write ack back to software dcc register
1402          * signify we have read data */
1403         if (dcrdr & (1 << 0))
1404         {
1405                 dcrdr = 0;
1406                 ahbap_write_buf_u16( swjdp, (u8*)&dcrdr, 1, DCB_DCRDR);
1407         }
1408
1409         return ERROR_OK;
1410 }
1411
1412 int cortex_m3_target_request_data(target_t *target, u32 size, u8 *buffer)
1413 {
1414         armv7m_common_t *armv7m = target->arch_info;
1415         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1416         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1417         u8 data;
1418         u8 ctrl;
1419         int i;
1420
1421         for (i = 0; i < (size * 4); i++)
1422         {
1423                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1424                 buffer[i] = data;
1425         }
1426
1427         return ERROR_OK;
1428 }
1429
1430 int cortex_m3_handle_target_request(void *priv)
1431 {
1432         target_t *target = priv;
1433         if (!target->type->examined)
1434                 return ERROR_OK;
1435         armv7m_common_t *armv7m = target->arch_info;
1436         cortex_m3_common_t *cortex_m3 = armv7m->arch_info;
1437         swjdp_common_t *swjdp = &cortex_m3->swjdp_info;
1438
1439         if (!target->dbg_msg_enabled)
1440                 return ERROR_OK;
1441
1442         if (target->state == TARGET_RUNNING)
1443         {
1444                 u8 data;
1445                 u8 ctrl;
1446
1447                 cortex_m3_dcc_read(swjdp, &data, &ctrl);
1448
1449                 /* check if we have data */
1450                 if (ctrl & (1 << 0))
1451                 {
1452                         u32 request;
1453
1454                         /* we assume target is quick enough */
1455                         request = data;
1456                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1457                         request |= (data << 8);
1458                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1459                         request |= (data << 16);
1460                         cortex_m3_dcc_read(swjdp, &data, &ctrl);
1461                         request |= (data << 24);
1462                         target_request(target, request);
1463                 }
1464         }
1465
1466         return ERROR_OK;
1467 }
1468
1469 int cortex_m3_init_arch_info(target_t *target, cortex_m3_common_t *cortex_m3, int chain_pos, const char *variant)
1470 {
1471         armv7m_common_t *armv7m;
1472         armv7m = &cortex_m3->armv7m;
1473
1474         /* prepare JTAG information for the new target */
1475         cortex_m3->jtag_info.chain_pos = chain_pos;
1476         cortex_m3->jtag_info.scann_size = 4;
1477
1478         cortex_m3->swjdp_info.dp_select_value = -1;
1479         cortex_m3->swjdp_info.ap_csw_value = -1;
1480         cortex_m3->swjdp_info.ap_tar_value = -1;
1481         cortex_m3->swjdp_info.jtag_info = &cortex_m3->jtag_info;
1482
1483         /* initialize arch-specific breakpoint handling */
1484
1485         cortex_m3->common_magic = CORTEX_M3_COMMON_MAGIC;
1486         cortex_m3->arch_info = NULL;
1487
1488         /* register arch-specific functions */
1489         armv7m->examine_debug_reason = cortex_m3_examine_debug_reason;
1490
1491         armv7m->pre_debug_entry = NULL;
1492         armv7m->post_debug_entry = NULL;
1493
1494         armv7m->pre_restore_context = NULL;
1495         armv7m->post_restore_context = NULL;
1496
1497         if (variant)
1498         {
1499                 cortex_m3->variant = strdup(variant);
1500         }
1501         else
1502         {
1503                 cortex_m3->variant = strdup("");
1504         }
1505
1506         armv7m_init_arch_info(target, armv7m);
1507         armv7m->arch_info = cortex_m3;
1508         armv7m->load_core_reg_u32 = cortex_m3_load_core_reg_u32;
1509         armv7m->store_core_reg_u32 = cortex_m3_store_core_reg_u32;
1510
1511         target_register_timer_callback(cortex_m3_handle_target_request, 1, 1, target);
1512
1513         return ERROR_OK;
1514 }
1515
1516 int cortex_m3_target_create(struct target_s *target, Jim_Interp *interp)
1517 {
1518         cortex_m3_common_t *cortex_m3 = calloc(1,sizeof(cortex_m3_common_t));
1519
1520         cortex_m3_init_arch_info(target, cortex_m3, target->chain_position, target->variant);
1521
1522         return ERROR_OK;
1523 }
1524
1525 int cortex_m3_register_commands(struct command_context_s *cmd_ctx)
1526 {
1527         int retval;
1528
1529         retval = armv7m_register_commands(cmd_ctx);
1530
1531         return retval;
1532 }